Factor out drawing context from platform window implementation

1 files changed, 141 insertions, 0 deletions

diff --git a/pugl/pugl_x11_cairo.c b/pugl/pugl_x11_cairo.c
new file mode 100644
index 0000000..3614c4b
--- /dev/null
+++ b/pugl/pugl_x11_cairo.c
@@ -0,0 +1,141 @@
+/*
+  Copyright 2012-2019 David Robillard <http://drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <cairo/cairo-xlib.h>
+#include <cairo/cairo.h>
+
+#include <X11/Xutil.h>
+
+#include "pugl/pugl_internal_types.h"
+#include "pugl/pugl_x11.h"
+#include "pugl/pugl_x11_cairo.h"
+
+typedef struct  {
+	cairo_surface_t* surface;
+	cairo_t*         cr;
+} PuglX11CairoSurface;
+
+static int
+puglX11CairoConfigure(PuglView* view)
+{
+	PuglInternals* const impl = view->impl;
+
+	XVisualInfo pat;
+	int         n;
+	pat.screen = impl->screen;
+	impl->vi = XGetVisualInfo(impl->display, VisualScreenMask, &pat, &n);
+
+	return 0;
+}
+
+static int
+puglX11CairoCreate(PuglView* view)
+{
+	PuglInternals* const       impl = view->impl;
+	PuglX11CairoSurface* const surface =
+		(PuglX11CairoSurface*)calloc(1, sizeof(PuglX11CairoSurface));
+
+	impl->surface = surface;
+
+	if (view->ctx_type == PUGL_CAIRO) {
+		surface->surface = cairo_xlib_surface_create(
+			impl->display, impl->win, impl->vi->visual, view->width, view->height);
+	}
+
+	if (!surface->surface) {
+		return 1;
+	}
+
+	int st = cairo_surface_status(surface->surface);
+	if (st) {
+		fprintf(stderr, "error: failed to create cairo surface (%s)\n",
+		        cairo_status_to_string(st));
+	} else if (!(surface->cr = cairo_create(surface->surface))) {
+		fprintf(stderr, "error: failed to create cairo context\n");
+	} else if ((st = cairo_status(surface->cr))) {
+		cairo_surface_destroy(surface->surface);
+		fprintf(stderr, "error: cairo context is invalid (%s)\n",
+		        cairo_status_to_string(st));
+	}
+	return st;
+}
+
+static int
+puglX11CairoDestroy(PuglView* view)
+{
+	PuglInternals* const       impl    = view->impl;
+	PuglX11CairoSurface* const surface = (PuglX11CairoSurface*)impl->surface;
+
+	cairo_destroy(surface->cr);
+	cairo_surface_destroy(surface->surface);
+	free(surface);
+	impl->surface = NULL;
+	return 0;
+}
+
+static int
+puglX11CairoEnter(PuglView* view)
+{
+	return 0;
+}
+
+static int
+puglX11CairoLeave(PuglView* view, bool flush)
+{
+	return 0;
+}
+
+static int
+puglX11CairoResize(PuglView* view, int width, int height)
+{
+	PuglInternals* const       impl    = view->impl;
+	PuglX11CairoSurface* const surface = (PuglX11CairoSurface*)impl->surface;
+
+	view->redisplay = true;
+
+	if (view->ctx_type == PUGL_CAIRO) {
+		cairo_xlib_surface_set_size(surface->surface, width, height);
+	}
+
+	return 0;
+}
+
+static void*
+puglX11CairoGetHandle(PuglView* view)
+{
+	PuglInternals* const       impl    = view->impl;
+	PuglX11CairoSurface* const surface = (PuglX11CairoSurface*)impl->surface;
+
+	return surface->cr;
+}
+
+PuglDrawContext puglGetX11CairoDrawContext(void)
+{
+	static const PuglDrawContext puglX11CairoDrawContext = {
+		puglX11CairoConfigure,
+		puglX11CairoCreate,
+		puglX11CairoDestroy,
+		puglX11CairoEnter,
+		puglX11CairoLeave,
+		puglX11CairoResize,
+		puglX11CairoGetHandle
+	};
+
+	return puglX11CairoDrawContext;
+}